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Thread: 1971 Donzi Classic 18 power....
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01-17-2017, 01:40 PM #16Screaming And Flying!
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About the fastest 18 Classic in the country is running a 383 with Whipple. He has done many radar runs at 90mph but has extensive set up time including a -2" to be able to achieve this somewhat safely. Just as a data point, the next 18's run in the mid to high 70's with standard Bravo drives. As has been said, the 24 degree deadrise round bottom takes a lot of seat time to get used to. Good Luck. I suspect if you converted and hung a 300X off the back of an 18 you would do a true 80.
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01-17-2017, 02:03 PM #17Screaming And Flying!
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83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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blacktruck liked this post
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01-17-2017, 02:35 PM #18The Historic Photo Master
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...You would have one of the fastest classic Donzi 18's out there. This is the way to fly. Closed cooling standard. Bolts right in.
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01-17-2017, 02:41 PM #19Screaming And Flying!
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These will give you what you want but you'll need to match it to one of his Vortec style intakes.
http://www.edelbrock.com/automotive/...c-200-sb.shtml
http://www.edelbrock.com/automotive/...r-gap-sb.shtml
and the cam etc.
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01-17-2017, 02:45 PM #20Screaming And Flying!
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Last edited by FMP; 01-17-2017 at 02:56 PM.
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01-17-2017, 02:58 PM #21Screaming And Flying!
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01-17-2017, 03:00 PM #22Screaming And Flying!
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Vic makes some nice stuff, but be prepared to cut off your left arm to pay for it.
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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01-17-2017, 03:03 PM #23Screaming And Flying!
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01-17-2017, 05:31 PM #24
*not intended for marine applications.*
You have to change the cam to a different lobe center line and upgrade valve springs, and running a set of cmi bypass headers is almost a must.
It's easy to tell who has built marine engines on here and who looks in the catalog
Call Tyler and chat with him sometime, he'll get ya going in the right direction.
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01-17-2017, 06:50 PM #255000 RPM
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I tried to call him, no response. Left a message. I did find a marinized SP383 with 435 hp that might work...it.ts a new engine so not able to find any experiences. The engines above are great, but they are very expensive....I really do appreciate the feedback! I also heard the Holley fuel injection system is not coast guard approved.
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01-17-2017, 08:49 PM #265000 RPM
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01-17-2017, 09:07 PM #27The Historic Photo Master
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Most all of the small-block horsepower building parts you buy, will not be Coast Guard Approved. Only marinized engine assemblies, and marine engine packages, will be Coast Guard approved.
Last edited by FUJIMO; 01-17-2017 at 09:11 PM.
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01-17-2017, 09:22 PM #28Screaming And Flying!
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Lot of airboat guys run the ZZ383 and now the newer upgraded SP383. They are new block, 4 bolt roller motors with good internals. Not the same as marine I know, but they seem to run out fine and last. I have a ZZ383 in my old Camaro and while it gives 450 hp, it is not very wildly cammed or have hi compression. The fast burn heads are the key, and it still uses pump gas.
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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Classic18 thanked for this post
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01-18-2017, 12:39 AM #29
It's the camshaft and to some more extent not having forged pistons or being clearenced properly along with the oil bypass needing to be modified. The hyperutectic cast pistons wear heavily in the wrist pins when run over 5k for extended time.
There was or still is a 385 hp "fast burn" 383 that made a decent boat motor with few needed changes.I've put many of those in smaller bajas and checkmates. Prop them @ 5200 and they've pretty happy.Last edited by Capt.Insane-o; 01-18-2017 at 12:43 AM.
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01-18-2017, 04:43 AM #30Screaming And Flying!
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Yeah, and that brings us back to the mercruiser package, right? These GMPP crates are "car" motors really.
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
Rebuild thread:
http://www.screamandfly.com/showthre...-it&highlight=
http://www.screamandfly.com/showthre...cs.&highlight=
Videos
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